The non–local contribution, \(\chi _4^{\rm nonloc, h}\) , has been calculated in [1]} and
is given by
\(\chi _4^{\rm nonloc, h} &=& \nu \eta ^8 p_\infty ^4 \pi \Biggl \lbrace - \frac{63}{4} - \eta ^2 \left(\frac{2753}{1120}- \frac{1071}{40} \nu \right) p_\infty ^2 - \ln \left(\frac{p_\infty }{2}\right)\Biggl [\frac{37}{5}+ \eta ^2\left(\frac{1357}{280} -\frac{111}{10} \nu \right)p_\infty ^2\Biggr ]\Biggr \rbrace \nonumber \\\) 
